GET

/v1/schemas/fal/image/fal-ai/wan-25-preview/text-to-image

Accept:

kind inputactivity imagehash e76aa97e…extracted Aug 10, 2026version currentsource upstream spec ↗

field	recorded source
schema	Source linked above. Source trace `1a592d0209248b8b139062102302680f731ca76de9a710654cae6aaf44a672ac` { "fetchedAt": 1786338105, "extractorVersion": "1", "verifiedAt": null }

Request body

7 properties · 1 required · 1 $defs

property	type	description	constraints
prompt*	string	The prompt for image generation. Supports Chinese and English, max 2000 characters.	length ≥ 1
num_images	integer	Number of images to generate. Values from 1 to 4.	1 ≤ n ≤ 4 · default: 1
seed	integer	Random seed for reproducibility. If None, a random seed is chosen.	nullable
image_size	ImageSize \| enum	The size of the generated image. Can use preset names like 'square', 'landscape_16_9', etc., or specific dimensions. Total pixels must be between 768×768 and 1440×1440, with aspect ratio between [1:4, 4:1].	default: "square"
enable_safety_checker	boolean	If set to true, the safety checker will be enabled. Disabling it requires account authorization; unauthorized requests are always checked.	default: true
enable_prompt_expansion	boolean	Whether to enable prompt rewriting using LLM. Improves results for short prompts but increases processing time.	default: true
negative_prompt	string	Negative prompt to describe content to avoid. Max 500 characters.	nullable

Types

1 $defs

ImageSizeobject

height	integer	The height of the generated image.	0 < n ≤ 14142 · default: 512
width	integer	The width of the generated image.	0 < n ≤ 14142 · default: 512

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"fal-ai/wan-25-preview/text-to-image","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}